<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow @click-left="$router.back()" title="黑马头条"></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
          <!-- :is_followed='article.is_followed' @update-follow='article.is_followed = $event' -->
          <follow-user class="follow-btn" v-model="article.is_followed" :user_id="article.aut_id" />
          <!--  如果子组件要对父组件穿的值做修改并且传回来 那么就用v=model v-model="article.is_followed相当于:value='article.is_followed' @input='@update-follow='article.is_followed = $event' -->

          <!-- <van-button class="follow-btn" type="badge" color="#3296fa" round size="small" icon="plus"
            v-if="!article.is_followed" @click="onFllowed(article.aut_id)" :loading="isFollowLoading">
            关注
          </van-button>
          <van-button class="follow-btn" round size="small" v-else @click="onFllowed(article.aut_id)"
            :loading="isFollowLoading">已关注</van-button> -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body" ref="content" v-html="article.content"></div>
        <van-divider>正文结束</van-divider>
        <!-- 评论 -->
        <ArticleComment :source="article.art_id" :list="list" @click-reply="clickReply" />
        <!-- 发布评论 -->
        <!-- <van-popup v-model="isPostShow" position="bottom">
          <comment-post :target="article.art_id" @post-success="onPostSuccess" />
        </van-popup> -->
        <!-- 发布评论 -->
      </div>
      <!-- /加载完成-文章详情 -->
      <!-- 加载失败：404 -->
      <div v-else-if="is404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="loadArtcileInfo" class="retry-btn">点击重试</van-button>
      </div>
    </div>

    <!-- 底部区域 -->
    <div v-if="article.title" class="article-bottom">
      <van-button class="comment-btn" type="default" round size="small" @click="isPostShow=true">写评论</van-button>
      <van-icon name="comment-o" badge="123" color="#777" />
      <collect-article class="btn-item" v-model="article.is_collected" :article-id="article.art_id" />
      <!-- <van-icon color="#777" name="good-job-o" /> -->
      <like-article class="btn-item" v-model="article.attitude" :article-id="article.art_id" />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
    <!-- <van-popup v-model="isPostShow" position="bottom" :style="{ height: '30%' }"> 123
    </van-popup> -->
    <!-- 文章发布评论 -->
    <van-popup v-model="isPostShow" position="bottom">
      <comment-post :target="articleId" @onpost-success="onPostSuccess" />
    </van-popup>
    <!-- /发布评论 -->
    <!-- 回复评论 -->
    <van-popup v-model="isReplyPostShow" position="bottom" style="height:100%">
      <CommentReply :comment="currentComment" v-if="isReplyPostShow" @close="isReplyPostShow = false" />
    </van-popup>
  </div>
</template>

<script>
import { getArticleById } from '@/api/article.js'
import { ImagePreview } from 'vant'
import { addFollow, deleteFollow } from '@/api/user'
import FollowUser from '@/components/follow-user'
import CollectArticle from './components/collect-article'
import likeArticle from './components/like-article'
import ArticleComment from './components/article-comment.vue'
import CommentPost from './components/post-comment.vue'
import CommentReply from './components/comment-reply.vue'
export default {
  name: 'Articles',
  data () {
    return {
      article: {}, // 文章详情
      loading: true, // 加载中的 loading 状态
      is404: false, // 失败的状态码
      isFollowLoading: false, // 按钮加载状态
      isPostShow: false,
      list: [], // 评论列表
      isReplyPostShow: false,
      currentComment: {} // 当前点击回复的评论项
    }
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  methods: {
    async loadArtcileInfo () {
      try {
        const res = await getArticleById(this.articleId)
        console.log(res)
        this.article = res.data.data
        console.log(this.article)
        // 加载完成
        this.loading = false
        this.$nextTick(() => {
          this.previewImg()
        })
      } catch (err) {
        // 加载失败 404
        if (err.response && err.response.status === 404) {
          this.is404 = true
        }
        this.$toast('获取失败')
        this.loading = false
      }
    },
    previewImg () {
      const contentEl = this.$refs.content
      console.log(contentEl)
      const imgs = contentEl.querySelectorAll('img')

      // 获取所有 img 地址
      const images = []
      imgs.forEach((img, index) => {
        images.push(img.src)

        // 给每个 img 注册点击事件，在处理函数中调用预览
        img.onclick = () => {
          ImagePreview({
            // 预览的图片地址数组
            images,
            // 起始位置，从 0 开始
            startPosition: index
          })
        }
      })
    },
    // 关注
    async onFllowed (userId) {
      this.isFollowLoading = true
      try {
        if (this.article.is_followed) {
          // 取关
          await deleteFollow(userId)
          this.$toast('取关成功')
        } else {
          // 点击关注
          await addFollow(userId)
          this.$toast('关注成功')
        }
        this.article.is_followed = !this.article.is_followed
      } catch (err) {
        if (err.response && err.response.status === 400) {
          return this.$toast.fail('不能关注自己')
        }
        this.$toast('操作失败')
      }
      this.isFollowLoading = false
    },
    onPostSuccess (e) {
      // 关闭弹出层
      this.isPostShow = false
      // 将发布内容显示到列表顶部
      this.list.unshift(e.new_obj)
    },
    // 回复评论
    clickReply (e) {
      this.isReplyPostShow = true
      console.log(e)
      this.currentComment = e
    }

  },
  computed: {},
  watch: {},
  filters: {},
  components: {
    FollowUser,
    CollectArticle,
    likeArticle,
    ArticleComment,
    CommentPost,
    CommentReply
  },
  created () {
    this.loadArtcileInfo()
  },
  mounted () { }
}
</script>

<style scoped lang='less'>
@import './github-markdown.css';
.article-container {
  .page-nav-bar {
    /deep/ .van-nav-bar__left {
      .van-icon-arrow-left {
        &::before {
          color: #fff;
        }
      }
    }
  }
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
